On Dez 17 2022, Andrew Waterman wrote: > On Sat, Dec 17, 2022 at 2:10 AM Andreas Schwab <sch...@linux-m68k.org> wrote: >> >> On Dez 17 2022, Andrew Waterman wrote: >> >> > It took me a few minutes to understand the purpose of this chicanery, but >> > there's indeed a contradiction in the ISA spec. HINT instructions _do_ >> > affect architectural state in a limited fashion--namely, updating the PC. >> >> How can an insn _not_ affect the PC? (Other than the trivial infinite >> loop.) > > Heh, yeah, that's roughly what I meant by "common-sense reading" (and > that's my rationale for simply clarifying the spec and nuking this > Xgnuzihintpausestate extension).
My point is that the implicit update of the PC cannot be part of the architectural state in the first place. Even the trivial infinite loop has this, before the actual state change (setting PC back) is performed. -- Andreas Schwab, sch...@linux-m68k.org GPG Key fingerprint = 7578 EB47 D4E5 4D69 2510 2552 DF73 E780 A9DA AEC1 "And now for something completely different."
